Grinding machine



THE. 1.

Sept. 17, 1929. w. J. BAUMBERGER 1,728,653

GRINDING MACHINE Filer Dec. 11, 1926- 3 Sheets-Sheet 1 7 Sept. 17',1929- w. J. BAUMBERGER GRINDING MACHINE Filed Dec. 11, 1926 SSheets-Shet 2 N MH jun-W702 TTGFNEYJ Sept. 17, 1929. w. J. BAUMBERGER1,723,653

GRINDING MACHINE FildDec. 11, 1926 3 Sheets-Sheet 3 Patented Sept. 17,1929 UNITEDWSTATES PATENT OFFICE,

WILLIAM J. BAUMIBEBGER, F nnr'rnnnoar, IOWA, Assreivon TO MIcRo MACHINEooMrA Y, or BErr'rEunoRr, IOWA, A CORPORATION or IOWA GRINDING MACHINEApplication filed December 11, 1926. Serial in. 154,067.

This invention relates to grinding machines and more particularly tomachines for grinding cylinders of a wide range of diameters. I

An object of this invention is to provide a grinding machine which maybe readily adjusted to grind cylindersof a widerange of diameters.

Another object of the inventionis to provide mechanism forthe grindingof cylinders of a wide range of diameters, said mechanism includingcounter-balancing means adjustable gor any position of the grindingWheel spin- A further obj ect of the invention is to provide a grindingmachine adapted to grind cylinders of a wide range of diameters, saidgrinding machine having means to automatically feed the grinding wheelto the work at every adjusted position of the grinding wheel spindle.

Other objects of the invention will be apparent to those skilled in theart fromthe de scription of it hereinafter given.

In the drawings:

Figure 1 is a vertical longitudinal section through my improved grindingmachine;

Fig. 2 is an enlarged vertical longitudinal section showing the grindingwheel spindle, the outer end of the headstock spindle, and as sociatedparts;

Fig. 3 is a transverse vertical section on line 3-3 of Fig. 2;and

Fig. i is a right hand end elevation of the structure shown in Fig. 2.

I have illustrated in the drawings a grinding machine having a rear orheadstock spindle 1, rotatable on its own axis and orbitally about anaxis eccentric to its own, namely, the axis of the cylindricalheadstock5. A front or grinding wheel spindle 2,shown as substantiallyparallel totherear spindle 1, carries a grinding wheel 3. The saidgrinding wheel spindle 2 is adjustably rotatable about the in termediateshaft 4: as an axis and thus axially adj ustable with respect to theheadstock spin} dle 1 for the size'of cylinder tobe ground. For thegrinding of a particular cylinder, therefore, the grinding wheel spindle2' may be adjusted relative to the headstock spindle Land moreover theheadstock spindle 1 may be adjusted relative to the cylindricalheadstock 5. By means of these two axial adjustments, therefore,cylinders of a wide range of diameter may be ground, from cylinders ofvery small diameter substantially equal to the rear spindle 1 bysuitable means such as M suitable gearing disposed within the casing 6carried by the outer end of the headstock spindle 1. Furthermore, at anyadjusted position of' the front spindle 2'relative to the rear spindle1, the said front or grinding wheel spindle 2 may be rotated in anorbital path about the axis of orbital movementof said rear spindle,namely, the axis of the r0- tatable headstock 5, simultaneously with therotation of the spindle 2 on itsown axis. 7 Means moreover are providedfor automatic continuous feeding of the grinding wheel to the work.Thus, the worm 7 may be automatically driven by means (notshown) to behereinafter discussed, whereby to automatically vary'the' eccentricityof the headstock spindle housing 8 within the rotating head- 1 stock 5;y i Referring particularlyto Fig. 1, the head of the grinding machinedesignated generally at 9 is provided with spaced bearing portions 10 inwhich therotating headstock 5 is journaled. The headstock 5 has aneccentric bore which has conical outwardly flaring end portions andwhichreceives the rear or head- 1 worm 7.

The headstock spindle 1 is j ournaled'eccentrically 1n the housing 8 andprojects beyond the forward end of said housing, carrying a gear 14onits forward end. The rearward end of the spindle '1 projects beyondthe end of the frame 15 and has a pulley 16 fixed thereto over which abelt may run to rotate the spindle 1 on its own axis.

The forward end of the headstock spindle housing 8 has a worm wheel 17fixed thereto which meshes with a worm 7 on a shaft 18, which shaft maybe operatedmanually by conventional means (not shown) to turn thehousing 8 in the headstock 5; Since the housing 8 is ecct-intricallymounted in the headstock 5 and the spindle l iseccentrically mounted inthe housing 8, said spindle 1 may be adjusted with respect to the axisof'the headstock 5-by rotating the housing 8' with respect to theheadstockfi. A. suitable automatic feed device for adjusting the axis ofthe spindle 1 relative to that of the headstock 5 is preferablyincorporated on this machine to vary the depth of cut'of thegrindingwheel while the machine is running. Such an auto matic feeddevice is shown and described in the patent to Hi MI Jerome 1,522,523,dated January 13, 1925.

The headstock 5 has two external gears 19 l and 33 fixed thereto bywhich it IDlYbB'lO- tated by power or byhand by means (not shown) torevolve the headstock 5 bodily and thereby revolve the spindle 1 in anorbital path about the axis of the headstock 5.

' 42 cooperaliile with the surface 41 and which is shown as integralwith the grinding wheel spindle-housing 21 ispivotallysecured to thegear housing 6 on the rotatable shaft '4 mounted substantially centrallyof the casing. G and cover plate 20 in suitable bearings 22; and 23 inthe housing 6. and cover plate 20 respectively. By reason ofits pivotalmounting, the cover plate 20 may beangularly adjusted through 360degrees or any fraction thereof, the complete range of adjustment of thegrinding wheel spindle being obtained by adjustment of the cover platethrough 180 and by means of the annular slot 24 in the gear housing 6,bolts 25, and nuts 2.6, the cover plate 20 may be secured to any pivotalor rotative position thereof. Within the housing 21'is shown thegrinding wheel spindle'2 mounted in suitable bearingsQT and 28. On theinner end of the spindle 2 within the gear housingG is'mounted a gear-29. On the outer end of the spindle 2 is mounted the grinding wheel 3.As previously mentioned, the outer end of the headstock spindle 1 carries a gear 14 which is disposed within the gear housing 6, the outerend of the spindle 1 being supported in a suitable bearing 30.

On the rotatable intermediate shaft 4 and keyed thereto are a pair ofgears 31 and 32.

The gear 31 is in cooperative relation with gear housing 6. Ifsodesired, a single gear might of course be employed on the intermediate:shaft 4 to cooperate with the spindle gears 14 and 29, in placeofthepair of gears 31 and 32.-

It'will moreover be noted that the spindle 1, shaft-4, and spindle 2-are so disposed in relation to each other that the spindle 2may bedisposed in direct axial alignment with thespindlel if desired,wherebyin suchcase the orbital movement of the grinding wheel 3 will beobtained entirely fromthe eccentric position of the spindle 1witlirespect to the rotating headstock member 5L Or-,if desired, thespindle 1 may be disposed concentrically with the headstock 5 andthe entire orbital movement of the grinding wheel 3 obtained from theeccentric adjustmentof the spindle 2 with respect to the spindle 1.

For certain cases'the spindle 2.1nay be disposed in actual axialalignment with the spin die 1 and the spindle 1 disposedconcentricallywith the headstock 5 whereby no orbital movement of the grinding.wheel 3wh'atsoever will be obtained. For the maximum orbital movement of thegrinding. machine the spindle 1:is disposedat' its maximum eccentricitywith respect to the headstock and the spindle 2. disposed at its.maximum eccentricity with respect to the spindle 1;

To counterbalance the weight ofthe grind ing Wheel 3, spindle 2,housing. 21 andFassociated parts, adjustable counterweighting means areprovided. Thus the counterweights 35 and 36 are each secured'to the gearhousing. 6 by a bolt 37"cooperalole with the annular slot 38, andia nut39. By suit ably adjusting the counterweights 35 and 36 the centrifugalforce of'the grinding wheel 3, housingv 2 and associated parts may becounterbalanced. at. any adjusted position of the cover plate 20withrespect to the gear vcasingaG whereby to obtain smooth and uniformoperation of the grindingmechanism'. It will bevnotedthat I haveprovided' 'grin'dingmechanismwherein an eccentricallyadjustablerotatable rear spindle is in continuous drivingrelation with aneccentrically adjustable rotatable grinding wheel 'spindle',

whereby at any adjusted position of said spindles, said grinding wheelspindle may be rotated on its own axis from said rear spindle andwhereby said grinding wheel spindle may be rotated in an orbital pathabout the axis of orbital movement of the rear spindle.

It will moreover be noted that with myimproved grinding mechanism thegrinding wheel may be automatically fed to the work regardless of thediameter of work for which the mechanism is adjusted. I

Furthermore, by means of the adjustable counterweighting means which Ihave provided, extreme smoothness of operation of my grinding mechanismis obtained, whereby to obtain maximum accuracy in grinding work of anydesired size.

It will thus be seen that my machine provides extreme flexibility,accuracy, and smoothness of operation for the grinding of cylinders of awide range of diameters from very small diameters to very largediameters and all intermediate diameters.

Furthermore, it is to be understood that the particular forms ofapparatus shown and described, and the particular procedure set forth,are presented for purposes of explanation and illustration and thatvarious modifications of said apparatus and procedure can be madewithout departing from my invention as defined in the appended claims.

What I claim is:

1. In a grinding machine, in combination, a longitudinally fixedrotatable cylinder, a rotatably adjustable rear spindle housingeccentrically journaled in said rotatable cylinder, a rotatable rearspindle eccentrically j ournaled in said rear spindle housing, means forrotating said rear spindle, a gear casing rigidly carried by said rearspindle housing at the forward end thereof, said rear spindle extendingforwardly into said casing, a gear casing cover cooperatively asso*ciated with said casing at the forward end thereof, a casing shaftparallel to said rear spindle rotatably carried by said casing and coversubstantially centrally thereof whereby said cover may be rotatablyadjusted through 180 degrees with respect to said casing, means forsecuring said cover in desired adjusted position, a grinding wheelspindle housin carried by said cover extending forwarc ly thereof, agrinding wheel spindle j ournalcd in said grinding wheel spindle housingand extending rearwardly into said casing, gearing within said housingoperatively connecting said rear spindle and grinding wheel spindlewhereby said grinding wheel spindle may be rotated at any adjustedposition thereof from said rear spindle, and whereby said grinding wheelspindle may be disposed and rotated in any one of a wide range ofadjusted positions to grind surfaces of a wide range of diameters.

2. In a grinding machine, in combination,

centrically join'naled'in saidrotatable cylinder, a rotatable rearspindle eccentrically journaled in said rear spindlehousing, means forrotating said rear spindle, a'gear casingrigidly carried by said rearspindle housing at the forward endthereof, said rear spindle extendingforwardly into said casing, a gear 'fc'asing cover cooperativelyassocated with said casingat the forward end thereof, a casing shaftparallel to said rear spindle rotatably carriedby said casing and coversubstantially centrally thereof whereby said cover may be rotatabyadjusted through 180 degreeswith respect to said casing, means forsecuring saidcover in desired adjusted position, a grinding wheelspindle housing carried by said cover extending forwardly thereof, agrinding wheel spindle journaled in said grinding wheel spindle housingand extending rearwardly into said casing, a pair ofgears mounted onsaid casing shaft and fixed thereto and rotatable therewith, a gearcarried by said rear spindle at theforwardend thereof in cooperativeengagement with one of said shaft gears, and a gear carried by saidgrinding wheel spindle at the rearward end thereof in cooperativeengagement withthe other- 0f said shaft gears, and whereby said grind ngwheel spindle may be disposed and rotated in any one of a wide range ofadjusted posit-ions to grind surfaces of a wide range of diameters. i

'lGO

3. In a grinding machine, in combination,

a rear spindle housing, a rotatable rear spindle eccentrically'journaled' in said rear spindle housing, means for rotating said rearspindle, a gear casing carried by said rear spindle housing at theforward end thereof, a gear casing cover cooperatively associated withsaid casing at the forward end thereof, a casing shaft parallel to saidrear spindle carried by said casing and cover substantially axiallythereof whereby said cover may be rotatably adjusted through 180degreeswith respect to said casing, means for securing said cover indesired adjusted position, a grinding wheel spindle housing" carried bysaid cover extending forwardly thereof, a grindingwheel spindlejournaled in said grinding wheel spindle housing, gearing within saidhousing operatively connecting said rear spindle and grinding wheelspindle whereby said grinding Wheel spindle may be rotated at anyadjusted position thereof from said rear spindle, and. a pair of counterweights secured to said casing an d independently adjustableperipherally of the casing to counterbalance accurately the grindingwheel spindle and associated parts at any position of adjustment ofsaidgrinding wheel spindle.

4. In a grm ding machine, in combination,

a rotatable cylinder, a rotatably' adjustable rear spindlehousingeccentrically journaled in saidrotatable cylinder, a rotatable rearspindle eccentrically journaled in said rear spindle housing, means forrotating said rear spindle, a gear casing rigidly carried by the saidrear spindle housing at the forward end thereof, said rear spindleextending forwardlyinto said casing, a substantially circular geareasing cover cooperatively associated with said casing, a casing shaftparallel to said rear spindle rotatably carried by said casing and coversubstantially axially thereof whereby said cover may be rotatably ad- Pjusted through 180 degrees about said casing shaft with respect to saidcasing, means for securing said cover in desired position of rotativeadjustment, a grinding wheel spindle housing carried by said cover, agrinding wheel spindle journaled in said grinding wheel spindle housingand extending rearwardly into said casing, said rear spindle andgrinding wheel spindle being parallel and disposed equi-distantlaterally from said casing shaft whereby said spindles may be disposedin longitudinal alignment, a pair of gears mounted on said casing shaftand fixed thereto and rotatable therewith, a gear carried by said rearspindle .at the forward end thereof in. cooperative engagement with oneof said shaft gears and a gear carried by said grinding wheel spindle atthe rearward end thereof in cooperative engagement with the other ofsaid shaft gears, whereby said grinding wheel spindle may be disposedand rotated in any one of a Wide range of adjusted positions to grindsurfaces of a wide range of diameters.

Intestimony whereof I affix my signature.

WILLIAM J. BAUMBERGER.

